Fix topic infos creation

apps/opencs/model/world/infocollection.hpp

@@ -56,6 +56,8 @@ namespace CSMWorld
         /// Works like getAppendIndex unless an overloaded method uses the record pointer
         /// to get additional info about the record that results in an alternative index.
 
+        int getAppendIndex (const std::string& id, UniversalId::Type type) const override { return getInsertIndex(id, type); }
+
         bool reorderRows(int baseIndex, const std::vector<int>& newOrder) override;
         ///< Reorder the rows [baseIndex, baseIndex+newOrder.size()) according to the indices
         /// given in \a newOrder (baseIndex+newOrder[0] specifies the new index of row baseIndex).